How to achieve picture gallery effect in uniapp

Uniapp is a cross-platform development framework that can easily develop iOS and Android applications at the same time. In uniapp, we can achieve the picture gallery effect by using the uni-gallery component. This article will introduce in detail how to implement the picture gallery effect in uniapp and provide code examples.

1. Install the uni-gallery component
Open the command line tool in the root directory of the uniapp project and execute the following command to install the uni-gallery component:

npm install @dcloudio/ uni-ui
2. Create a picture gallery page
First, create a new Gallery page in the pages directory of the uniapp project, and write the following code in the Gallery.vue file:

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<button @click="showGallery">打开图库</button>
<uni-gallery style="width:100%;height:100%;display:none;" :url-list="urlList" :show="isShow" @change="onGalleryChange" @close="onGalleryClose"></uni-gallery>

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export default {
data() {

return {
  urlList: [], // 图片地址数组
  isShow: false // 是否显示画廊
}

},
methods: {

showGallery() {
  this.urlList = [
    'https://example.com/image1.jpg',
    'https://example.com/image2.jpg',
    'https://example.com/image3.jpg'
  ]; // 设置图片地址数组
  this.isShow = true; // 显示画廊
},
onGalleryChange(index) {
  console.log('当前展示第' + (index + 1) + '张图片');
},
onGalleryClose() {
  console.log('关闭画廊');
  this.isShow = false; // 隐藏画廊
  this.urlList = []; // 清空图片地址数组，以便重新加载
}

}
}
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Code analysis:
First, through the click of a button Event showGallery to display the gallery. In the showGallery method, we first set an array of image addresses urlList, and then set the isShow variable to true to display the gallery component.

In the uni-gallery component, we pass in the image address array by setting the url-list attribute. The gallery component reloads the images when the urlList is updated. Control the display and hiding of the gallery by setting the show attribute. In the change event, we can get the currently displayed image index and perform some custom operations. In the close event, when the gallery is closed, we set the isShow variable to false to hide the gallery and clear the urlList array so the images can be reloaded.

3. Use the picture gallery effect
In order to use the picture gallery effect in actual applications, we can use the Gallery page as an entrance, for example, add the following code to the App.vue file:

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<router-view></router-view>

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export default {
mounted() {

uni.navigateTo({
  url: '/pages/Gallery' // 打开Gallery页
});

}
}
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In the mounted life cycle hook function, we use the uni.navigateTo method to open the Gallery page. In this way, when the application is opened, the Gallery page will automatically display, thereby showing the picture gallery effect.

Summary:
By using the uni-gallery component, we can easily achieve the picture gallery effect in uniapp. With just a few lines of code and an array of image addresses, you can create a fully functional image gallery. I hope the sample code in this article can help you achieve the picture gallery effect you need in uniapp.

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